pythonblockconsequence.java

drools 一个开放源码的规则引擎

package org.drools.semantics.python;

/*
 * $Id: PythonBlockConsequence.java,v 1.4 2005/11/10 04:54:43 mproctor Exp $
 *
 * Copyright 2002 (C) The Werken Company. All Rights Reserved.
 *
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided that the
 * following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright statements and
 * notices. Redistributions must also contain a copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. The name "drools" must not be used to endorse or promote products derived
 * from this Software without prior written permission of The Werken Company.
 * For written permission, please contact [e-mail].
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 * 4. Products derived from this Software may not be called "drools" nor may
 * "drools" appear in their names without prior written permission of The Werken
 * Company. "drools" is a registered trademark of The Werken Company.
 *
 * 5. Due credit should be given to The Werken Company.
 * (http://drools.werken.com/).
 *
 * THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE WERKEN COMPANY OR ITS CONTRIBUTORS BE
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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import org.drools.rule.Rule;
import org.drools.smf.SemanticComponent;
import org.drools.spi.Consequence;
import org.drools.spi.ConsequenceException;
import org.drools.spi.Tuple;
import org.python.core.Py;

/**
 * Python block semantics <code>Consequence</code>.
 * 
 * @author <a href="mailto:[e-mail]">bob mcwhirter </a>
 */
public class PythonBlockConsequence extends PythonInterp
    implements
    Consequence,
    SemanticComponent
{
    
    protected final String        semanticType    = "python";

    protected final String        name;    
    // ------------------------------------------------------------
    // Constructors
    // ------------------------------------------------------------

    /**
     * Construct.
     */
    protected PythonBlockConsequence(String text,
                                     Rule rule)
    {
        super( text,
               rule,
               "exec" );
        this.name = "consequence";
    }

    // ------------------------------------------------------------
    // Instance methods
    // ------------------------------------------------------------

    public String getSemanticType()
    {
        return semanticType;
    }

    public String getName()
    {
        return this.name;
    }      
    
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    // org.drools.spi.Consequence
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    /**
     * Execute the consequence for the supplied matching <code>Tuple</code>.
     * 
     * @param tuple
     *            The matching tuple.
     * @param workingMemory
     *            The working memory session.
     * 
     * @throws ConsequenceException
     *             If an error occurs while attempting to invoke the
     *             consequence.
     */
    public void invoke(Tuple tuple) throws ConsequenceException
    {
        try
        {
            Py.runCode( getCode( ),
                        setUpDictionary( tuple,
                                         getRule( ).getParameterDeclarations( ).iterator( ) ),
                        getGlobals( ) );
        }
        catch ( Exception e )
        {
            throw new ConsequenceException( e,
                                            getRule( ) );
        }
    }
}